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Tristan wrote: "Why are you putting bulls**t out on the internet I thought this was supposed to be confidential.

"Hello?"

Kimberly wrote back: "Listen I'm about done with this s**t you and ur only acting like a b***h because you have Kris Jenner up ya ass!!!!! From here on out it's out of my hands I'm tired of keeping quiet!! Lisa bloom can be scared of y'all but ifgaf I'm gonna talk and talk and keep talking cause it's my f**king mouth!!"

Kimberly Alexander says Tristan fathered her son (Image: Instagram)

Tristan responded: "Come on .. Why are you lying about a f**king video? and Kris has nothing to do with anything so I don't know why you're trying to include her this is between us and the kid nothing or nobody else."

Kim then told him: "Well when you decide to go with kris's and Khloe's testing facility cause you know what the f**k I know .. and you're little hush money would never be enough to hide the fact that there's a child involved in this & the fact that you call my lawyers threatening to sue over the fact that I knew about your little attempt to Sabotage this situation. It all says a lot but just know I'll be suing you for all this s**t you're putting me & our son through!

"You and I both know what the f**k happened so you can keep living this little fairy tale.. and ima keep living reality and very soon you'll be woken up from it."

Kimberly says she hired attorney Lisa Bloom, but that her firm dropped the case when they failed to reach a settlement with Tristan, who already shares True, two, with Khloe, and son Prince, three, with ex Jordan Craig.

Their texts wee leaked online

Tristan and Khloe have handed Kimberly a cease and desist (Image: Getty Images for Remy Martin)

According to emails, Kim's son is named Peyton.

She was asked by the Bloom firm when she and Peyton would be available to take the paternity test as Tristan had done his swab.

But she wasn't happy that he'd used a DNA testing facility known to the Kardashian family.

Tristan has agreed to take a second paternity test, on the understanding that it's carried out by a clinic that's AABB accredited, which deals with the compliance standard of labs.

Kimberly says she's certain Tristan is the father of her son as she was "100% only with him" and claims that he paid people off.

But she says she won't be silenced (Image: Instagram)

She also insisted she has a lot of dirt on Tristan in the form of a video of herself performing oral sex on him, as well as other things.

Kimberly went on to claim in an Instagram post that the paternity test results had been tampered with.

She claimed they were "trying to sabotage a DNA test with Tristan Thompson regarding my son that he has been neglecting since birth I know for sure that Tristan Thompson is the father of my child".

But according to E! News, Tristan and Khloe have sent a cease and desist letter to Kim.

Kardashian lawyer Marty Singer confirmed Tristan has taken a paternity test and that it was negative.

In the cease and desist, Kimberly is requested to "immediately stop defaming them and malicious defamatory lies and specious fabrications."

The letter was sent one day after the alleged testing paperwork was published.

After receiving it, she took to her Instagram story to hit back.

She wrote: "Lies????? Where is the lie?? My truth will be heard #Eonline".

She added: "My onlyfans link will be back up soon. Will need money for legal troubles."

The letter from Mr Singer read: "It has been proven that Mr. Thompson is not the father of your child and we demand that you stop claiming that he is, and that he and Ms. Kardashian somehow falsified the paternity test results.

"It is defamatory per se to falsely assert that someone is a deadbeat dad who allegedly does not support his children, and to falsely accuse my clients of faking paternity test results."